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M. SGHWEIZER,

MARKING KNIFE BLADES.

Patented Nov. 13, 1883.

Jay. 2.

' WWWW III/[III 13/0 71 for. 7- 6 T all whom it may v UNITED "STATES.

PATENT OFFICE.

MAXIMILIAN SOHWEIZER, on NAUBUO, coNNEcTIcur. I

MARKING KNIFE-(BLADES.

concern Be it known that I, MAXIMILIAN SOHWEIZER, of Naubuc, Hartford county, Connecticut, have invented certain Improvements in Marking dies.

suitable varnish, is brought upon an intervensuitable fabric, and presses the same firmly Knife-Blades, 850., of which the following is a specification.

Myinvention consists in a mode of mark ing. knife-blades, plates, and other articles, and in apparatus therefor, whereby I am enabled to operate with greater certainty and rapidity, secure a sharper .impression, and.

avoid the necessity of frequently replacing the In the drawings, Figure 1 is a front elevation ofan improved press used in carrying out my invention, and Fig. 2 is a sectional elevationv l In carrying out my invention the knife blade or other plate to be marked is first coated with varnish, and then by presssing a stamp of the desired configuration ona fabric uponthe varnished surface the parts of such varnish correspondingto the design are re moved, exposing the metal, which is then etched in the usual manner. Thus a steel stamp, I, above the blade :0, coated with a ing tissue, y, ofl silk, muslin,paper or other upon the varnished surface of the blade, when the varnish will be caused to adhere to the absorbent material wherever the latter. has been brought forcibly in contact therewith, so that on lifting the die and removing the fabric the latter will carry with it so much of the coating as corresponds to the face of thedie, thereby exposing the design upon the plate, which can be at once etched. v v I r It will be apparent that different forms of machines may be used in carrying out this modeof marking the plates, and thatit is necessary to employ a varnish capable of being affixed to the ribbon by pressure, but not adhering thereto by mere contact, and which will resist'the acid and permit deep etching.

A machine which has proved tobe effective is shown in the drawings, consisting of a base,

A, supporting an anvil, B, in the form of a semi-sphere, the rounded portion fitting a cor- November 13, 1883.

responding socket in the base, so that theanvil will accommodate itself readily to the form of the plate to be marked, that the upper face of the latter may be brought absolutely parallel with the face of the die I. The die is secured to a plunger, 0, sliding in the end of an overhangingarm, D, secured to the base, and the strip y extends, in the form of a ribbon, beneath the die to rollers E E, supported by a frame, F, carried by the movable plunger,

and clamped by thumb-nuts q. A lever, G,

or other suitable device, serves to depress the plunger to bring the die upon the ribbon and upon the plate. A spring, a", raises the plunger when pressure is removed.

I am aware of theordinary markingpresses carrying a ribbon and die. The combination above described differs from such devices in I to secure the adhesion of the coating placed upon the article to be marked, andIuse means for holding the ribbon firmly, so that it will As the ribbon becomes,

rise with the die. clogged with varnish it is moved to bring new surfaces below the die.

I claim I f l. The mode of marking metal plates, consisting in coating the same with a varnish, and

in then removing the latter to correspond with the desired designby pressing a stripof fabric with a die upon the varnished face, removing the strip with the adhering coating, and theu etching the surface thus exposed, as set forth.

2. The combination, in a machine forpreparing plates for etching, of an anvil or rest, a movable die-holder and die, and supports holding between the die and rest a strip of fabric, substantially as described, adapted to carrywith it so much of the varnish as corresponds to theface of the die, as set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

MAXI ILIAN SOHWEIZER.

Witnesses: v

THEODORE TRIEBEL, WM. SOHIEDING. 

